Maybe I'm missing something but where do the other 2 oarspeople () sit? Does order matter? I'll assume not.
First ask, how many ways are there of picking the first 3? Answer:
Now for each one of those you have 5 different people left. How many ways are there to pick the next 3? Answer:
Now for each of those you have 2 people left and 2 spots (whether they oar or not), but there is only 1 way to pick them.
So either I am understanding the problem wrong or the answer you have is wrong. I don't think I'm doing it wrong based on my interpretation but you never know...